Polishing-machine



C. A. WICKSTROM.

POLISHING MACHINE. Aiwucmou, HLED mm. 28. ms;

Patented May 3, 1921.

5 SHEET S-SHEET' I C. A. WICKSTROM. POLISHING MACHINE. APPLICATION FILED MAR. 28. I918.

Patented May 3, 1921.

5 SHEETS-SHEET 2.

C. A. WICKSTROM. POLISHING MACHINE. APPucmou FILED MAR. 28, 1918- Patnted May 3, 1921.

5 SHEETS-SHEET 3.

I /WWII! MQN C. A. WICKSTROM. POLISHING MACHINE. APPLICATION FILED MAR. 2a. 1918.

Patented May 3,1921.

5 SHEETSSHEET 4.

'C. A. WIC KSTROM. :POLI SHHVG MACHINE.

APPLICATION FILED MAR. 28, 1918. Patented May 3,1921.

I |lllllllll|llllllllllllllllllllllllllllu l ll" ||I um ||m|| uh" I I "will 22 "'Iulflmmm UNITED STATES PATENT OFFICE.

ASSIGNOR TO WESTERN ELECTRIC A CORPORATION OF NEW YORK.

YOLISHIN G-MACHIN E.

To all whom it may concern:

Be it known that I, CHARLES A. WICK- STROM, a citizen of the United States, re

sidin at Chicago, in the county of Cook and tate of Illinois, have invented certain new and useful Improvements in Polishing- Machines, of which the following-is a full, clear, concise, and exact ClQSCIIPtIOIl.

This invention relates to polishing machines, and more particularly to a machine for polishing flat surfaces.

The object of this invention in general is to provide a compact, easily accessible, and convenient machine for rapidly and thoroughly polishing flat surfaced articles without the aid of skilled operators.

In accordance with one feature of this invention there is provided a mechanism adapted to be mounted on a bench with the working or polishing surface and work holding mechanism conveniently located above the bench while the operating mechanism and supporting structure is located below the bench. The supporting structure preferably comprises two separable members adapted to house and support the operating mechanism and is provided with means for conveniently securing the apparatus to the bench.

Another feature of this invention relates to an improved work holding device, by means of which a plurality of similar articles, the faces of which are to be polished, may be held in operative relation to the polishing surface with a uniform pressure regardless of allowable manufacturing variations in the sizes of the parts. This mechanism may comprise a main holder supplied with a plurality of individual holders each of which is provided with spring controlled clamping elements which cooperate to maintain a uniform pressure upon each of the devices to be pol1shed.

Other features of the invention relate to the specific details of construction of the i work holding clamps, and to other details of construction and combination of parts as will hereinafter more fully appear.

In the drawings illustrating thls invention Figure 1 is a plan view of the mechanism embodying the invention;

Specification of Letters Patent.

Patented May 3, 1921.

Application filed March 28, 1918. Serial No. 225,234.

Fig. 2 device;

Fig. 3 is a tranverse sectional view taken upon the line 33 of Fig. 1;

Fig. 4 is a longitudinal sectional view taken upon line 4-4 of Fig. 1;

Fig. 5 is a plan view of the device with a port on removed showing the driving mechanlsm;

F 6 is a detailed sectional view illustrating one position of the polishing surface clamping device;

Fig. 7 is a plan view of a jack strip upon which the device of this invention is adapted to operate, and

Fig. 8 is a View in front elevation of the device shown in Fig. 7..

As shown in the drawings, 5 and 6 designate upper and lower base members which are adapted to be secured together in any suitable manner and to be secured to the lower face ofa bench top 7, as shown in Fig. 3, with the polishing surface and work holding means extending through an opening 8 in the bench top.

A. polishing surface 10, which may be emery cloth or any other similar material, is secured to a supporting plate 11 which is mounted to reciprocate longitudinally in a frame 12 which is reciprocally mounted in guides or'way's 13, 13 in the upper frame member 5.

Secured to the lower frame member 6 is a suitable driving device such as the motor 15 which is connected through a worm 16 and gear 17 to a shaft 18 located within a housing or bearing 14 secured to the lower frame member 6. Mounted upon the upper end of the shaft 18 within the base member 6 is a gear Wheel 19 meshing with a second gear wheel 20 carried by a shaft 21 and secured to a fly wheel or inertia member 22 by means of screws 23, 23. Carried by the gear wheel 20 is an eccentrically mounted pin 25, to one end of which is connected the crank arm 26, the other end of which is pivotally secured is a view in side elevation of the to the supporting plate 11. The supporting plate is thereby reciprocated by the crank arm 26 through the rotation of the gear wheel 20.

Mounted upon the lower end of the shaft 21 is a pinion 30 meshing with a gear wheel 31 supported upon a shaft 32 below the frame member 6. This gear wheel 31 drlves an eccentric rod 35, one end of which is attached to a reciprocating link 36, the other end of which link is connected with a pivotal link 37 secured to a rock shaft 38 having its upper end secured to projectin lugs 39, 39 projecting from the transverse y reciprocatin plate 12. On its end opposite to the link 3 tllQ'IOCk shaft 38 also carries a link 41, the upper end of which is also atframe in an upward direction. At its free end the frame 50 is provided with a handle 56, by means of which the frame 50 may be raised and lowered, and a spring operated trigger 57 is adapted to catch and retain the free end of said frame'to support the work in operative position to the polishing surface. Between the ends of the frame member 50 are two transversely arranged rows 60 and 61 of clampin lugs each comprising a pivotally supporte lever 62 provided on one side with a projecting 111 63 adapted to engage a piece of work 64. %ach lever is also provided with a projecting finger member 65 adapted to rest upon one end of a coiled spring 66, the other end of whichrests upon t frame member 50. Secured to each of the levers 62 is a crank arm 67. The crank arms of oppositely disposed clamping lugs are, connected by means of a bar 68 which engages the crank arms 67 of one row of clam s upon the upper side of their pivots and t e other crank arms 67 of theotherrow of clamps upon the lower side of their pivots. Each crank arm of one row of clamping means is provided with an upward] extending operating lever or handle 70, t e operation of which serves to rotate the clamping means 60, 61 of the two rows to engage and disengage the work. This handle or lever extends upwardly through openings 71, 71 between sheet metal shields 72, 72.and is adapted to be swung laterally into a lockingnotch 73 to retain the work clamping means ina locked position. Leaf springs 75, 7 5 are adapted to en-f gage the article to be polished upon the side of a projecting lug or ear 76 opposite tothat which is engaged by the clamping lugs 63, 63 to lift the work from -'the polishing surface when the pressure of. the clamping lugs 63, 63 is removed. .A- work holding device as constructed is capable of carrying a plurality of similar articles to be polished and to insure that each of the articles will a be held against the polishing surface with a sufficient pressure to insure the proper polishing thereof regardless of manufacturing variationsin the dimensions of the articles.

Clamping means for. securing the polishing surface 16 to-the supporting plate 11 comprises. a stationary clamp member 80 consisting of a movable plate 81 adapted to be movedtoward andaway from the supporting plate 11 'bymeans of an eccentric nut 82. An adjustable clamping means comprising a movable plate 83 carried by a movable bracket member 84 is adjustable with respect theretothrough the agency of an eccentric nut 85, and the member 84 is adj ustable With respect to the plate 11 through the agency of a clamping bolt 86.

By the construction 7 and combination of parts whereby the polishing mechanism may be located out of the way below the bench top with only the polishing "surface and article clamping means exposed above the bench, there is obtained an economy of space and a very convenient and safe arrangement for the operator, since no moving parts other than the polishing surface are exposed to the operator.

What'is claimed is: I 1. In a machine for polishing fiat surfaced articles, the combination with a bench top provided with an opening therefor, of a polishing surface extending through said opening, and operating mechanisinfor said polishing surface located below said bench top and secured thereto.

2. In a polishing machine, a polishing surface, operatin mechanism for moving said surface wit a constantly changing direction of movement, separable supporting operating mechanism and said polishing surface, a bench top, and means for securing the machine to the bench top.

3. In a polishing machine, the combine- .tion with a polishing surface and an article 0 be polished, of spring pressed clamping eans adapted to engage op osite ends of t e article to be polished and an. operative connection between the clamping means at opposite ends of said article.

I 4. In a polishing machine, a polishing surface and a work holding device including a plurality of individual article holding devices each comprising a air of oppositely located spring pressed 0 amping members and an operative connection between the clamping members of each'pair.

n a polishing machine, the combination with a polishing surface and an article to be polished, of spring pressed clamping means adapted to engage opposite ends of, the article to be polished, means connecting members for housing and supporting said I said clamping means at opposite ends of said at, a crank arm secured to each of said article adapted upon operation to operate I clamping means,abar connecting said crank said clamping means, and means located at arms, and an operating handle secured to one one end of the article to be polished for of said crank arms whereby both of said 5 operating said connecting means. clamping means are operated simultane- 15 6. In a polishing machine, the combinaously. tion. with a polishing surface and an article In witness whereof, I hereunto, subscribe to be polished, of spring pressed clamping my name this 7th day of March A. D., 1918. means at opposite ends of the article to be 10 polished adapted to engage the article there- CHARLES A. WICKSDROM. 

